MOKPHOLOGY AND EVOLUTION
to those in Man. The digital formula is as in other Apes, and the thumb is very small The proximal parts of the digits are united by a web, and the terminal phalanges have flat nails. The primitive pads are
FIG. 19B.—The hand of the Chimpanzee (G) and Gorilla! (B) showing the flexure grooves and papillary ridges.
reduced to those on the terminal phalanges. The palm is glabrous and pigmented, and is traversed by the usual flexure lines and papillary ridges. The flexure Hnes (fig. 19) are simpler than in many Apes; they consist